Heavyweight Thunder is a boxing simulator, with the unusual addition of a
first-person mode. Also featured is a mouse-driven swinging system (the two
mouse buttons correspond to your two fists, and by moving the mouse in certain
directions, you can create various combos), and a career mode with a focus on
not only what fights you win, but what you own.

Included are an instant action mode, a tournament mode, and a career mode.